You have to think in SQL.
(varFilterCombo=1 AND Employees.Country like "%" + varSearchText + "%")
OR
(varFilterCombo=2 AND Employees.City like "%" + varSearchText + "%")
OR
(varFilterCombo=2 AND Employees.Phone like "%" + varSearchText + "%")
(varFilterCombo=1 AND Employees.Country like "%" + varSearchText + "%")
OR
(varFilterCombo=2 AND Employees.City like "%" + varSearchText + "%")
OR
(varFilterCombo=2 AND Employees.Phone like "%" + varSearchText + "%")